Electrical heater



'.1. M. BAKER ELECTRICAL HEATER Filed Jan. 14, 1928 John MBJwr f y Unirse-STAT Patented Dec. 18,

JOHN M. BAKER, OF COIJJV'MBUSQOIIIO'.y

. l ELECTRICAL HEATER.

Application mea January 14, 192s. serial 110.246,844.

` This invention relates to'iiiiprov'ements in electrical heating units, arid has for its pri- ,improve heating 'for the purpose ofpquic ly, elitciently and 10, -fset'hforth whereinuseis made yof aperrfofrate .zcasln adapted for tliepreception of theheat- 'lng e ement proper, the' latter consisting ofk temperature.

mary ob'cct the Apr'civision of a simple and unitp frticularly adapted econoinlcally 4hegting liquids forthe purpose of raising the latter to an elevated or boiling "Another object -irrt',ention resides 'in a, small compact imitfor the. purpose above arr insulated plate elanipedbetween the section halves of the outer casing, thes'aid Vplatey being provided with the electrical resistance coils through which-electrical energy is transmitted for fthe' wpose of heating the coils andr to permit t e heat thus Uenerated to be directly transmitted to the llquid in which the casing or the heating unit as a whole is immersed.

With these and other objects in view, as will appear as the description proceeds, the invention consists in the novel features of construction, combinations of elements and arrangements of parts hereinafter to be more specifically pointed out in the appended claims.

In the accompanying drawing:

Figure 1 is a perspective view illustrating my improved heating unit,

Figure 2 is a top plan view with the upper half of the casing removed for the purpose of disclosing interior structure,

Figure 3 is a transverseO sectional view taken on the plane indicated on the line 33 of Figure 2,

Figure 4 is a vertical longitudinal sectional View;

f Referring more particularly to the draw` ing the numeral 1 designates the casing of the heating unit. In this instance the casing is formed to include a pair of metallic sections A and B, both of which are perforated las indicated at 2 for the purpose of permitting of the free circulation of a liquid through the casing. The lower section' B is` provided with downwardly extending knobs 3, which elevate the casing above a base surface to permit conveniently of the aforesaid circulation of liquid.

Interiorly each section is provided with an inwardly extending boss 4 arranged approximately in the center of the casing. The boss in the section Bis provided with an opening for the reception of the shank of a.v securing screwA 5, the threaded end of the latter being received within a threaded opening provided m the boss depcndingfrom the section A.

The screw 5 is cniployed tdlioldfthe section in secured and assembled relationship.

Arranged to be elampedfbetween andV frictionafllyf'held by' thebosses l is a lathorizontally'disposedfplate'it. preferably of an insulating material. It will be ysecn"that when the screw 5 is tightened frictional pressure will exerted on the opposite side of the plat-e 6, by the action of the bosses 4 and thefscrew', to securely hold the plate against` dislocation. The plate in this instance is provided with-a ypairof spaced terminahscrews 'Tand 8. Connected with thel terminalm-is the inlett leady 9 of an'electrical yconductor which leads to any suitable source of current supply such as the lighting circuit of a residence or other building. Connected with the inlet lead is a resistance coil 10, Which is located between the section B and the under side of the plate 6. The coil 10 extends substantially the full length of the plate and terminates in a wire 11 which is received within a notch 12 provided in one end of the plate. The wire 11 terminates, in turn, in a coil 12 which extends substantially the full length of the plate 6 and is disposed between the upper surface of saidplate and the upper casing section A. The coil 12 terminates i 'in a wire 13 which is received within a notch 141 provided at one end of the plate G opposite to the notch 12. The wirelS then passes along the lower surface ofk the plate and is trained through a second notch 111 and ends in a coil 15 which is arranged on the upper surface of the plate adjacent to the coil 12. The coil 15 ends in a wire 16 which is received wit-hin a. notch 17 provided in the plate 6 in the same edge of the latter as the notch 12, and the wire 16 then terminates in a coil 1.8, which is arranged adjacent to the under side of the plate 6 and in parallel relationship p with the coil '10. The coil 1S is connected with the outlet terminal 8, to which is also connected the outlet lead or Wire 19, providing the circuit return. By virtue of this construction it will be seen that when current is passed throughy the single length of wire constituting lthe coil 10, 12, 15 and 18 the latter will become highly heated as is customary in electrical resistances of thischarllC acter. I prefer to use the alloy ot` nickel and chromium in the formation ot this resistanee unit. In use, the heater is innnereed in the liquid to be heated and Current is then passed through the coil to bring the latter to a glowing temperature. Since the easing l is ot' ay perforated type the liquid upon being heated will be positively circulated past the resistance coils producing thereby a very etlicient transiter oi heat. The device operates very .euecesatully in connection with ordinary house currents and provides a lSimple and convenient means lio-r quickly bringing water or the lil-Ie to boiling temperatures` or tor any other general heating purpoae.

llfhat claimed is:

l. An iinmersible ater heater comprising a casing termed to include separable upper and lower sections, the Walls ot' said seetiona being of perfor-ate eonstructionT registering bosses projecting inuardl ia the walls` of Said sections, a plate oi eulation elaniped between the meeting Surtaceii ol :seid l s1 ki. a threaded connecting element arrai g ally ot' said bosses tor retaining said seetions and plates in rigidly aeeembled relationship, and. a plurality ot electrically heated Coils extending longitudinallj.' acrossy the upper and lower Surfaces of said plate and spaced from the walls ot'. said "using, said coils being arranged for direct contact with the liquid circulating through the casing.

2. An innnersible Water heater comprising a easing formed to include Separahle upper and lower sections, the walls ot said Sections being et' pcrtorate coi'istruction, registering bosses projecting inwardly from the walls ot Said Sections, a plaie oit insulating mate rial clamped between the meeting nl'aees ot Said bosses and formed with spaced notches in the opposite ends ot said plate, threaded connecting elements arranged axially et said bosses t'or retainingl aid sections and plate in rigidly assembled relation-drip, and a plurality ol' electricallyv heated coilA extending longitudinally across the upper and lower fairlfaeesv ot' said plate and engaging said notchee, Said coil` being tenaionally held and retained Within Said notches by their inherent reSilieney` the Said coils being also arranged Spaeed from the Walla ot the ing and in direct Contact with the liquid circuhlting through the said casing.

ln testin'iony whereot l atlix my Signature.

JOI-I)v M. BAKER. 

